From 506b28fb998280c6b704945893520c97f7311a1c Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 21 Mar 2019 10:26:41 -0700 Subject: [PATCH] rcuperf: Fix cleanup path for invalid perf_type strings [ Upstream commit ad092c027713a68a34168942a5ef422e42e039f4 ] If the specified rcuperf.perf_type is not in the rcu_perf_init() function's perf_ops[] array, rcuperf prints some console messages and then invokes rcu_perf_cleanup() to set state so that a future torture test can run. However, rcu_perf_cleanup() also attempts to end the test that didn't actually start, and in doing so relies on the value of cur_ops, a value that is not particularly relevant in this case. This can result in confusing output or even follow-on failures due to attempts to use facilities that have not been properly initialized. This commit therefore sets the value of cur_ops to NULL in this case and inserts a check near the beginning of rcu_perf_cleanup(), thus avoiding relying on an irrelevant cur_ops value. Signed-off-by: Paul E. McKenney Signed-off-by: Sasha Levin --- kernel/rcu/rcuperf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index 3424452..19249b8 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -561,6 +561,10 @@ rcu_perf_cleanup(void) if (torture_cleanup_begin()) return; + if (!cur_ops) { + torture_cleanup_end(); + return; + } if (reader_tasks) { for (i = 0; i < nrealreaders; i++) @@ -681,6 +685,7 @@ rcu_perf_init(void) pr_cont(" %s", perf_ops[i]->name); pr_cont("\n"); firsterr = -EINVAL; + cur_ops = NULL; goto unwind; } if (cur_ops->init) -- 2.7.4